Erich's full-house puzzles

These clever puzzles by Erich
Friedman were first show-cased at mathpuzzle.com
in July 2004, where I fell in love with them immediately. Erich
kindly provided me with another fifteen puzzles to feature here
at clickmazes in interactive form.

sample puzzle
click button to start

Aim
For each puzzle find the starting square and draw a path moving
horizontally and vertically that passes through each open square
exactly once. At each move the blue runner will always run straight,
as far as possible, stopping only when blocked by the grid's
edge, a black square, or a square already visited.

Controls
Use the puzzle drop-list to select a puzzle.
Use mouse clicks for movement (and more... see below)
Use restart (action) or the space key to reset.

Movement
Click on gridto mark your start position.
Click on grid to move (or use the cursor keys).
Click on the start-mark to reset current puzzle.
Click on any path corner to unwind to that point.